It is knows that Ruby mysql driver supports prepared statements. Why do not active record adapters support them? Is there any reason for it?
Well, ActiveRecord sort of *does* support prepared statements, in the sense that parameterized queries are a type of prepared statement, and ActiveRecord uses parameterized queries. Are you looking for precompiled prepared statements? If so, perhaps stored procedures would be the way to go (although mySQL's procedural language sucks)?
Best,